| 摘要 |
The invention relates to a process for the preparation of an aromatic hydrocarbon mixture, wherein one or more monooelfins with two to four carbon atoms per molecule or aliphatic hydrocarbons, at least 50 %wt of which consisting of the said olefins, are contacted at a temperature of between 325 and 700 DEG C with a catalyst containing a crystalline gallium silicate, which silicate has the following distinguishing features after calcination for one hour in air at 500 DEG C: (a) an X-ray powder diffraction pattern that contains as strongest lines the four lines listed in table A, TABLE A d(A) 11.1 +/- 0.1 10.0 +/- 0.1 3.84 +/- 0.07 3.72 +/- 0.06 and, (b) in the formula which gives the composition of the silicate expressed in moles of the oxides, the SiO2/Ga2O3 mol. ratio is between 25 and 250, and wherein, if the silicate has a SiO2/Ga2O3 mol. ratio of 100-250, the catalyst is subjected to a two-stage treatment comprising a first stage in which the catalyst is contacted for at least 15 minutes at a temperature of 350-700 DEG C with a hydrogen-containing reducing gas, followed a second stage in which the catalyst is contacted for at least 15 minutes at a temperature of 350-700 DEG C with an oxygen-containing oxidizing gas. The relation between the C5 <+> content and the aromatics content in the hydrocarbon mixture obtained is improved. |
